-preview switches

[Arine]

On Wednesday, 1 April 2020 at 14:26:15 UTC, Atila Neves wrote:
> Walter and I discussed this last week.
>
> I think the right way to nudge D programmers to transition to 
> where we can turn -preview into -revert is to issue deprecation 
> messages for a while. Nothing like a noisy build to get people 
> to file issues on github (or even better, PRs) to get this 
> fixed.
>
> I expect the annoying messages to happen soon. Then we have to 
> decide on how long of a period is appropriate to start break 
> builds.

So basically warning messages? Does that mean this issue will 
finally be fixed? https://issues.dlang.org/show_bug.cgi?id=259


#issue259